Drill bit fishing device of downthehole breaking of rod pole of pile foundation

The utility model provides a drill bit fishing device of downthehole breaking of rod pole of pile foundation for the salvage drill bit that drops, it is connected with drill bit drilling rod and tool joint on the drill bit to drop, drill bit fishing device of downthehole breaking of rod pole of pile...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	XIE YAPENG, YANG QINGHUA, WANG LIYONG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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